/*
* Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @summary primtive stream collection with summary statistics
* @bug 8044047
*/
package org.openjdk.tests.java.util.stream;
import org.testng.annotations.Test;
import java.util.ArrayList;
import java.util.DoubleSummaryStatistics;
import java.util.IntSummaryStatistics;
import java.util.List;
import java.util.LongSummaryStatistics;
import java.util.stream.Collectors;
import java.util.stream.DoubleStream;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
import java.util.stream.OpTestCase;
import static java.util.stream.LambdaTestHelpers.countTo;
import static java.util.stream.ThrowableHelper.checkNPE;
@Test
public class CollectAndSummaryStatisticsTest extends OpTestCase {
public void testIntCollectNull() {
checkNPE(() -> IntStream.of(1).collect(null,
IntSummaryStatistics::accept,
IntSummaryStatistics::combine));
checkNPE(() -> IntStream.of(1).collect(IntSummaryStatistics::new,
null,
IntSummaryStatistics::combine));
checkNPE(() -> IntStream.of(1).collect(IntSummaryStatistics::new,
IntSummaryStatistics::accept,
null));
}
public void testLongCollectNull() {
checkNPE(() -> LongStream.of(1).collect(null,
LongSummaryStatistics::accept,
LongSummaryStatistics::combine));
checkNPE(() -> LongStream.of(1).collect(LongSummaryStatistics::new,
null,
LongSummaryStatistics::combine));
checkNPE(() -> LongStream.of(1).collect(LongSummaryStatistics::new,
LongSummaryStatistics::accept,
null));
}
public void testDoubleCollectNull() {
checkNPE(() -> DoubleStream.of(1).collect(null,
DoubleSummaryStatistics::accept,
DoubleSummaryStatistics::combine));
checkNPE(() -> DoubleStream.of(1).collect(DoubleSummaryStatistics::new,
null,
DoubleSummaryStatistics::combine));
checkNPE(() -> DoubleStream.of(1).collect(DoubleSummaryStatistics::new,
DoubleSummaryStatistics::accept,
null));
}
public void testIntStatistics() {
List<IntSummaryStatistics> instances = new ArrayList<>();
instances.add(countTo(1000).stream().collect(Collectors.summarizingInt(i -> i)));
instances.add(countTo(1000).stream().mapToInt(i -> i).summaryStatistics());
instances.add(countTo(1000).stream().mapToInt(i -> i).collect(IntSummaryStatistics::new,
IntSummaryStatistics::accept,
IntSummaryStatistics::combine));
instances.add(countTo(1000).parallelStream().collect(Collectors.summarizingInt(i -> i)));
instances.add(countTo(1000).parallelStream().mapToInt(i -> i).summaryStatistics());
instances.add(countTo(1000).parallelStream().mapToInt(i -> i).collect(IntSummaryStatistics::new,
IntSummaryStatistics::accept,
IntSummaryStatistics::combine));
for (IntSummaryStatistics stats : instances) {
assertEquals(stats.getCount(), 1000);
assertEquals(stats.getSum(), countTo(1000).stream().mapToInt(i -> i).sum());
assertEquals(stats.getAverage(), (double) stats.getSum() / stats.getCount());
assertEquals(stats.getMax(), 1000);
assertEquals(stats.getMin(), 1);
}
}
public void testLongStatistics() {
List<LongSummaryStatistics> instances = new ArrayList<>();
instances.add(countTo(1000).stream().collect(Collectors.summarizingLong(i -> i)));
instances.add(countTo(1000).stream().mapToLong(i -> i).summaryStatistics());
instances.add(countTo(1000).stream().mapToLong(i -> i).collect(LongSummaryStatistics::new,
LongSummaryStatistics::accept,
LongSummaryStatistics::combine));
instances.add(countTo(1000).parallelStream().collect(Collectors.summarizingLong(i -> i)));
instances.add(countTo(1000).parallelStream().mapToLong(i -> i).summaryStatistics());
instances.add(countTo(1000).parallelStream().mapToLong(i -> i).collect(LongSummaryStatistics::new,
LongSummaryStatistics::accept,
LongSummaryStatistics::combine));
for (LongSummaryStatistics stats : instances) {
assertEquals(stats.getCount(), 1000);
assertEquals(stats.getSum(), (long) countTo(1000).stream().mapToInt(i -> i).sum());
assertEquals(stats.getAverage(), (double) stats.getSum() / stats.getCount());
assertEquals(stats.getMax(), 1000L);
assertEquals(stats.getMin(), 1L);
}
}
public void testDoubleStatistics() {
List<DoubleSummaryStatistics> instances = new ArrayList<>();
instances.add(countTo(1000).stream().collect(Collectors.summarizingDouble(i -> i)));
instances.add(countTo(1000).stream().mapToDouble(i -> i).summaryStatistics());
instances.add(countTo(1000).stream().mapToDouble(i -> i).collect(DoubleSummaryStatistics::new,
DoubleSummaryStatistics::accept,
DoubleSummaryStatistics::combine));
instances.add(countTo(1000).parallelStream().collect(Collectors.summarizingDouble(i -> i)));
instances.add(countTo(1000).parallelStream().mapToDouble(i -> i).summaryStatistics());
instances.add(countTo(1000).parallelStream().mapToDouble(i -> i).collect(DoubleSummaryStatistics::new,
DoubleSummaryStatistics::accept,
DoubleSummaryStatistics::combine));
for (DoubleSummaryStatistics stats : instances) {
assertEquals(stats.getCount(), 1000);
assertEquals(stats.getSum(), (double) countTo(1000).stream().mapToInt(i -> i).sum());
assertEquals(stats.getAverage(), stats.getSum() / stats.getCount());
assertEquals(stats.getMax(), 1000.0);
assertEquals(stats.getMin(), 1.0);
}
}
}